New Twiddle

components.my-component.js

import Component from '@ember/component'

export default Component.extend({
  tagName: '',
  aIsChecked: false,
  bIsChecked: false,
  someOtherMethod() {
    console.log('someOtherMethod() this = ', this)
  },
  someMethod() {
    console.log('someMethod() this = ', this)
    this.someOtherMethod()
  },
  actions: {
    someAction() {
      console.log('someAction() this = ', this)
      this.someOtherMethod()
    }
  }
})

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle'
});

templates.application.hbs

{{my-component}}

templates.components.my-component.hbs

<pre>click=(action 'someAction')</pre>
{{input type="button" value="test" click=(action 'someAction')}}
(should work)

<hr>

<pre>click=someMethod</pre>
{{input type="button" value="test" click=someMethod}}
(should NOT work)

<hr>

<pre>click=(action someMethod)</pre>
{{input type="button" value="test" click=(action someMethod)}}
(should work)


<hr>

<strong>>> open your console</strong>

twiddle.json

{
  "version": "0.15.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.js",
    "ember": "3.4.3",
    "ember-template-compiler": "3.4.3",
    "ember-testing": "3.4.3"
  },
  "addons": {
    "ember-data": "3.4.2"
  }
}